Siemens S5-135U/155U appendix Start Address

Analog Input/Output Modules

Start Address,	For analog output modules ( 8 outputs) only the lowest address (start address)
Subaddress	is set. Other addresses (subaddresses) are decoded on the module.

Note

The start address of an analog module must be a multiple of the double channel number.

8 channels : 0, 16, 32, 48, ... 240

If one of the outputs (Channel 0 to 7) of a module is to be addressed, the relevant subaddress must be specified in the program.

The subaddress of the output, based on the start address of the module, is given by:

Start address + 2 x channel no. = subaddress

Example:

Analog output module with 8 outputs

The address is the sum of the significances set with the individual coding switches.

160 = 128 + 32 = 27 + 25

On Setting

(Switch Pressed)

IB 160

128	64	32	16	8	4	2	1
ADB7	ADB6	ADB5	ADB4	ADB3	ADB2	ADB1	ADB0

A module with 8 outputs (Channel 0 to 7) and start address 160 reserves the address range from

160 to address 160 + 7 x 2 = 174

In this example, the next free address for another module is 176.

Addresses already assigned must not be set again.

System Manual	9-103
C79000-G8576-C199-06